Laser additive manufactured Ti-6Al-4V alloy: tribology and corrosion studies

Journal article

Authors / Editors

Bhero, Shepherd

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Publication Details

Author list: Chandramohan P, Bhero S, Obadele BA, Olubambi PA

Publisher: Springer Verlag (Germany)

Place: LONDON

Publication year: 2017

Journal: International Journal of Advanced Manufacturing Technology (0268-3768)

Journal acronym: INT J ADV MANUF TECH

Volume number: 92

Issue number: 5-8

Start page: 3051

End page: 3061

Number of pages: 11

ISSN: 0268-3768

eISSN: 1433-3015

Languages: English-Great Britain (EN-GB)

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Abstract

The effect of heat treatments (HT) on wear and corrosion of direct metal laser-sintered Ti-6Al-4V specimens have been studied. Rectangular parts were built in vertical (VB) and horizontal (HB) directions and heat treated above beta transus and below beta transus with different cooling rate. Rotary wear tests have been carried out under varying loads of 5 N, 15 N and 25 N at 25 m/s. Corrosion behaviour were analysed in 1 M H(2)SO(4,)1 M HCl and 3.5% NaCl solutions. Wear volume loss of both HB and VB are less in specimens subjected to HT 2 than in HT1 which is attributed to more grain refinement. Presence of compact oxide debris on the surface of HT 2-VB specimen could have contributed to the low wear volume. A sharp positive difference could be observed in OCP immersed in 1 M H(2)SO(4)solution from -0.6 V (as-sintered) to 0.069 V (HT 1-HB) and 0.089 V (HT 2-HB). Icorr value in 1 M H2SO4 improved after both the heat treatments from 17.450 mu A/cm(2) to 1.470 and 0.152 11 mu A/cm(2), respectively. Generally, heat-treated specimens (both horizontal and vertical) show better corrosion resistance than the as-sintered specimens in all the three media.

Keywords

corrosion, heat treatment, Microstructure, Wear

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